<template>
    <div class="upload-file">
        <el-upload :on-change="handleChange" :auto-upload="autoUpload" :disabled="disabled" ref="upload" :action="uploadFileUrl" :data="{bizId,bizType}" :before-upload="handleBeforeUpload" :file-list="fileList" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed" :on-success="handleUploadSuccess" :show-file-list="false" :headers="headers" class="upload-file-uploader">
            <!-- 上传按钮 -->
            <el-button size="mini"  type="primary" :disabled="disabled">{{  uploadBtnText}}</el-button>
            <!-- 上传提示 -->
            <div class="el-upload__tip" slot="tip" v-if="showTip" v-html="$t('public.uploadTips',[fileSize,fileType.join('/')])"></div>
        </el-upload>

        <!-- 文件列表 -->
        <transition-group v-if="showFileList" class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
            <li class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList" :key="file.url">
                <el-link :underline="false" target="_blank" @click.prevent="look(file.url)">
                    <span class="el-icon-document"> {{ file.name }} </span>
                </el-link>
                <div class="ele-upload-list__item-content-action">
                    <el-link :underline="false" @click.prevent="downloadfile(file.url,file.name)" type="success">{{$t('public.templateDownload')}} </el-link>
                    <el-link :underline="false" @click="handleDelete(file,index)" type="danger" v-if="!disabled">{{$t('public.delete')}}</el-link>
                </div>
            </li>
        </transition-group>
    </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import { deleteFile } from '@/api/file/file'
let Base64 = require('js-base64').Base64
export default {
    name: 'FileUpload',
    props: {
        //by zhongwd
        //whether to render the file list
        showFileList:{
            type:Boolean,
            default:true//
        },
        //single upload
        singleUplaod:{
            type:Boolean,
            default:false//
        },
        uploadButtonText:{
            type:String,
            default:null
        },
        autoUpload:{
            type:Boolean,
            default:false// false manually submit to adapt to server that does not support upcase file extions
        },
        // 值
        value: [String, Object, Array],
        // 数量限制
        limit: {
            type: Number,
            default: 5,
        },
        // 大小限制(MB)
        fileSize: {
            type: Number,
            default: 5,
        },
        disabled: {
            type: Boolean,
            default: false,
        },
        /* */
        ifDelete: {
            type: Boolean,
            default: true,
        },
        // 文件类型, 例如['png', 'jpg', 'jpeg']
        fileType: {
            type: Array,
            default: () => [
                'doc',
                'xls',
                'ppt',
                'txt',
                'pdf',
                'png',
                'jpg',
                'jepg',
                'gif',
                'svg',
            ],
        },
        bizId: { type: [String, Number], default: '' },
        bizType: {
            type: String,
            default: 'UPLOAD_FILE_OTHERS',
        },
        otherList: {
            type: Array,
            default: undefined,
        },
        // 是否显示提示
        isShowTip: {
            type: Boolean,
            default: true,
        },
    },
    data() {
        return {
            uploadFileUrl: process.env.VUE_APP_BASE_API + '/file/file/upload', // 上传的图片服务器地址
            headers: {
                Authorization: 'Bearer ' + getToken(),
            },
            fileList: [],
            previewImageAPI: process.env.VUE_APP_PREVIEW_API
        }
    },
    watch: {
      otherList: {
        handler(val) {
          if (val) {
            console.log('watch===>', val)
            let fileList = [...val]
            fileList.forEach((io) => {
              io.name = io.originalFileName
              if (io.filePath.startsWith("http://") || io.filePath.startsWith("https://")) {
                io.url = io.filePath
              }
            })
            this.fileList = fileList
          }
        },
        deep:true
      },
    },
    computed: {
        uploadBtnText(){
            if(this.uploadButtonText==null)
            {
             //   {{$t('functionAnalysis.selectFile')}}
             return this.$t('functionAnalysis.selectFile');
            }
            return this.uploadButtonText;
        },
        // 是否显示提示
        showTip() {
            return this.isShowTip && (this.fileType || this.fileSize)
        },
    },
    mounted() {
        console.log('otherList====>', this.otherList)
    },
    methods: {
        //by zhongwd
        handleChange(file){
            try
            {
                let fileName=file.name;
                let index= fileName.lastIndexOf(".");
                let ext = fileName.substr(index+1);
                let prePath=fileName.substr(0,index+1);
                //Server doesn't support upcase extensions
                fileName=prePath+ext.toLowerCase();//
                this.fileName = fileName;
                let f=new File([file.raw],fileName);
                f.uid=file.uid;
                file.raw=f;
                this.$refs.upload.submit();
            }
            catch(e)
            {
                console.error(e);
            }
        },
        downloadfile(url,fileName){
            const newUrl = url;
            const x = new XMLHttpRequest();
            x.open("GET", newUrl, true);
            x.responseType = "blob";
            x.onload = () => {
                const url = URL.createObjectURL(x.response);
                const a = document.createElement("a");
                a.href = url;
                a.download = fileName;
                a.target = "_blank";
                a.click();
            };
            x.send();

        },
        look(url){
            window.open(this.previewImageAPI+'/onlinePreview?url='+encodeURIComponent(Base64.encode(url)));
        },
        clearFiles() {
            this.$refs.upload.clearFiles()
            this.fileList = []
        },
        // 上传前校检格式和大小
        handleBeforeUpload(file) {

            debugger;
            let fileName=file.name;
            let index= fileName.lastIndexOf(".");

            let ext = fileName.substr(index+1);
           // console.log('Before toLowerCase:',ext);
            let prePath=fileName.substr(0,index+1);
            //console.log('After toLowerCase:',ext.toLowerCase());
            fileName=prePath+ext.toLowerCase();

           // file.name=fileName;
            this.fileName = fileName;
            let f=new File([file.raw],fileName);
            f.uid=file.uid;
            file.raw=f;


            // 校检文件类型
            if (this.fileType) {
                let fileExtension = ''
                if (file.name.lastIndexOf('.') > -1) {
                    fileExtension = file.name.slice(
                        file.name.lastIndexOf('.') + 1
                    )
                }
                const isTypeOk = this.fileType.some((type) => {
                    if (file.type.indexOf(type) > -1) return true
                    if (fileExtension && fileExtension.indexOf(type) > -1)
                        return true
                    return false
                })
                if (!isTypeOk) {
                    this.$message.error(
                        `文件格式不正确, 请上传${this.fileType.join(
                            '/'
                        )}格式文件!`
                    )
                    return false
                }
            }
            // 校检文件大小
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize
                if (!isLt) {
                    this.$message.error(
                        `上传文件大小不能超过 ${this.fileSize} MB!`
                    )
                    return false
                }
            }
            return true
        },
        // 文件个数超出
        handleExceed() {
            this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`)
        },
        // 上传失败
        handleUploadError(err) {
            this.$message.error('上传失败, 请重试')
        },
        // 上传成功回调
        handleUploadSuccess(res, file, fileList) {
            console.log('fileList', res)
            if (res.code === 200) {
                this.$message.success('上传成功')
                this.fileList.push({
                    name: res.data.originalFileName,
                    url: res.data.url,
                    bizType: res.data.bizType,
                    id: res.data.id,
                })
                this.$emit('input', this.listToString(this.fileList))
                this.$emit('change', [...this.fileList],this)
                //
                if(this.singleUplaod)
                {
                    this.clearFiles();
                }
            } else {
                this.$message.error(res.msg)
            }
        },
        // 删除文件
        handleDelete(file, index) {
            this.fileList.splice(index, 1)
            deleteFile(file.id).then((res) => {})
            this.$emit('input', this.listToString(this.fileList))
            this.$emit('change', [...this.fileList])
        },
        // 获取文件名称
        getFileName(name) {
            if (name.lastIndexOf('/') > -1) {
                return name.slice(name.lastIndexOf('/') + 1).toLowerCase()
            } else {
                return ''
            }
        },
        // 对象转成指定字符串分隔
        listToString(list, separator) {
            let strs = ''
            separator = separator || ','
            for (let i in list) {
                strs += list[i].url + separator
            }
            return strs != '' ? strs.substr(0, strs.length - 1) : ''
        },
    },
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
    margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
}
.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
}
.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}
</style>
